Lincoln bulletin SSM 54643
What it saysSome 2024-2026 Nautilus non-hybrid vehicles may exhibit a rattle or buzzing noise from under the center of the car during light throttle, low engine revolutions per minute (RPM) driving conditions, often between 30-40… NHTSA’s full summary ↓
Lincoln filed this with NHTSA as a service bulletin dated Mar 10, 2026, received Mar 11, 2026, about the power train. It names 3 model years (2024–2026). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationSome 2024-2026 Nautilus non-hybrid vehicles may exhibit a rattle or buzzing noise from under the center of the car during light throttle, low engine revolutions per minute (RPM) driving conditions, often between 30-40 mph (48-64 km/h). The noise may be more noticeable when ambient temperatures are below 40°F (4°C). Inform the customer that Ford is currently working on a solution for this condition that is expected Q4 2026. This concern does not affect vehicle durability and the customer can continue to drive the vehicle. Monitor Professional Technician System (PTS) for additional information and schedule a service appointment for the customer once the repair becomes available.<br /><br /> If a customer vehicle exhibits this concern, submit a Vehicle Concern Report. To submit a report, click on the "Submit Global Concern Report (GCR)" link at the upper right of the PTS Vehicle ID screen (vehicle identification number ÝVIN¨ required) and fill out the form. Do not use the "Report A Problem" link to submit a report for this condition.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SSM 54643 | Service bulletin | Mar 10, 2026 | 11029936 | PDF, 70 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 75 complaints with NHTSA since 2015. 1 of them name Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The Lane keeping assistance has failed multiple times when the car enters an intersection and the lines on the road are broken by a gap due to a turn. To situations occurred where the car aggressively entered oncoming traffic lane and I quickly directed the car back to the correct lane. Lane keeping assistance seems to be very touchy.
2026 Lincoln Nautilus · Power Train · filed with NHTSA Sep 15, 2026
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the power train
Source: same model, same component group22 other manufacturer communications filed against the Lincoln Nautilus under the same component group (power train), newest first. The eight newest are listed; the rest are on the Lincoln list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB 26-2341 v2 | Service bulletin | Sep 17, 2026 | This bulletin supersedes 26-2171. Reasons for update: update the Parts list to add a note to clarify the application of the part numbers W52… |
| TSB 26-2341 | Service bulletin | Jul 23, 2026 | This bulletin supersedes 26-2171. Reasons for update: update the Parts list to add a note to clarify the application of the part numbers W52… |
| TSB 26-2328 | Service bulletin | Jul 15, 2026 | This bulletin supersedes 26-2194. Reason for update: update the Parts list to correct a part description " Loctite 638", update the claim qu… |
| SSM 54924 | Service bulletin | Jun 12, 2026 | Some 2024-2026 Nautilus vehicles equipped with an 8F35 transmission may exhibit an illuminated malfunction indicator lamp (MIL) with diagnos… |
| TSB 26-2270 | Service bulletin | Jun 3, 2026 | This bulletin supersedes 26-2140. Reason for update: update the Parts list to correct the part description of the part number JM5Z-7N473-C… |
| TSB 26-2194 | Service bulletin | Apr 26, 2026 | This bulletin supersedes 25-2627. Reason for update: To add a Step to reprogram the all-wheel drive (AWD) module for Bronco Sport vehicles.… |
| TSB 26-2140 | Service bulletin | Apr 21, 2026 | Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: * Intermittent or permanent n… |
| TSB 25-2627 | Service bulletin | Feb 9, 2026 | This article supersedes TSB 25-2552 to update the Parts List Some of the vehicles listed in the Model statement above may exhibit all of the… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Lincoln, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Lincoln SSM 54643 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the SSM 54643 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does SSM 54643 cover?
The manufacturer filed it against 3 model years: 2026 Lincoln Nautilus, 2025 Lincoln Nautilus, 2024 Lincoln Nautilus. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.